Abstract
Analyses of biospheres, ecosystems, and/or plants from the First Law of Thermodynamics have brought about fruitful results, while comparatively few studies on application of the Second Law of Thermodynamics to biospheres (ecosystems) have been conducted. We studied the effects of elevated CO2 concentration ([CO2]), effects of elevated air temperature, and effects of both elevated [CO2] and elevated air temperature on entropy production of a small biosphere (plants) using a chamber system called ENTRON. We found that elevated [CO2] had little effect on the entropy production, while elevated air temperature reduced significantly the entropy production. Change in evapotranspiration rate from the plants due to the environmental change was the main reason of the change in entropy production.
